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Frame 09: Encrypt frames

This example shows how to fragment an original binary frame. Then shows how to encrypt each fragment. ASCII frames are not permitted. The resulting encrypted fragments are stored in frame.bufferFragment and the length of this buffer is frame.lengthFragment

Required materials

1 x Waspmote 1 x MiniUSB wire 1 x Battery

Code

/*
------ FRAME_09 - encrypted fragments --------
Explanation: This example shows how to fragment an original binary
frame. Then shows how to encrypt each fragment.
ASCII frames are not permitted.
The resulting encrypted fragments are stored in frame.bufferFragment
and the length of this buffer is frame.lengthFragment
Copyright (C) 2017 Libelium Comunicaciones Distribuidas S.L.
http://www.libelium.com
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Version: 3.0
Design: David Gascón
Implementation: Yuri Carmona
*/
#include <WaspFrame.h>
#include <WaspAES.h>
// define the Waspmote ID
char waspmote_id[] = "node_01";
// Define private 16-Byte key to encrypt message
char password[] = "libeliumlibelium";
void setup()
{
// init USB port
USB.ON();
USB.println(F("Start program"));
USB.println(F("-------------------------------"));
USB.println(F("Only BINARY frames can be "));
USB.println(F("fragmented if required "));
USB.println(F("-------------------------------"));
USB.println();
// set the Waspmote ID
frame.setID(waspmote_id);
}
void loop()
{
///////////////////////////////////////////
// 1. Create BINARY frame
///////////////////////////////////////////
// create new frame (BINARY)
frame.createFrame(BINARY);
// set frame fields
frame.addSensor(SENSOR_STR, "string1");
frame.addSensor(SENSOR_BAT, PWR.getBatteryLevel());
frame.addSensor(SENSOR_STR, "string2");
frame.addSensor(SENSOR_BAT, PWR.getBatteryLevel());
frame.addSensor(SENSOR_STR, "string3");
frame.addSensor(SENSOR_BAT, PWR.getBatteryLevel());
frame.addSensor(SENSOR_STR, "string4");
frame.addSensor(SENSOR_BAT, PWR.getBatteryLevel());
frame.addSensor(SENSOR_STR, "string5");
frame.addSensor(SENSOR_BAT, PWR.getBatteryLevel());
frame.addSensor(SENSOR_STR, "string6");
frame.addSensor(SENSOR_BAT, PWR.getBatteryLevel());
frame.addSensor(SENSOR_STR, "string7");
frame.addSensor(SENSOR_BAT, PWR.getBatteryLevel());
frame.addSensor(SENSOR_STR, "string8");
frame.addSensor(SENSOR_BAT, PWR.getBatteryLevel());
// print frame
USB.println(F("Original frame:"));
frame.showFrame();
USB.println();
///////////////////////////////////////////
// 2. Create encrypted fragments
///////////////////////////////////////////
// iterate via
while (frame.createFragmentHeader(60) > 0)
{
/////////////////////////////////////////
// 2.1. Generate fragment
/////////////////////////////////////////
frame.generateFragment();
USB.println(F("-------------------------------"));
USB.print(F("Fragment frame:"));
USB.printHexln(frame.bufferFragment, frame.lengthFragment);
/////////////////////////////////////////
// 2.2. Encrypt fragment
/////////////////////////////////////////
/* Calculate encrypted message with ECB cipher mode and ZEROS padding
The Encryption options are:
- AES_128
- AES_192
- AES_256
*/
frame.encryptFragment( AES_128, password );
USB.print(F("Encrypted fragment frame:"));
USB.printHexln(frame.bufferFragment, frame.lengthFragment);
USB.println(F("-------------------------------"));
USB.println();
}
USB.println();
delay(5000);
}

Output

H#
Last modified 2yr ago